Improvement in solutions for electroplating



UNITED STATES PATENT ()rrroa.

HENRY G. COYLE, OF WEST MERIDEN, CONNECTICUT, ASSIGNOR OF ONE- HALF HISRIGHT TO CHARLES H. SHAW, OF SAME PLACE.

IMPROVEMENT IN SOLUTIONS FOR ELECTROPLATING.

Specification forming part of Letters Patent No. 162,627, dated April27, 1875; application filed April 12, 1875.

To all whom it may concern:

Be it known that I, HENRY G. COYLE, of West Meriden, in the county ofNew Haven and State of Connecticut, have invented a new Solution forElectroplating; and I do hereby declare the following to be a full,clear, and exact description of the same.

This invention relates to thepreparation of a solution in which adeposit of tin may be made upon any metal without previous preparationof the surface.

Tin has usually been deposited by dipping the surface to be coated intoa bath of molten tin, the surface having been previously prepared by acoating of copper, or otherwise, to

, cause the tin to adhere. In electroplating With tin a similarpreparation of the surface has been essential, and then generallyunsuccessful.

The object of this invention is to make an electro deposit of tinWithout such previous preparation, and upon any metal. To this end thisinvention consistsin a solution composed of muriate of tin, sulphate ofammonia, sulphuric acid, aqua ammonia, urine, and water, in theproportions substantially as hereinafter specified.

Take of muriate of tin, three (3) parts; sulphate of ammonia, eight (8)parts; sulphuric acid, four (4) parts; aqua ammonia, five (5) parts, andto these, thoroughly mixed, add urine, ten (10) parts, and Water, twohundred and sixty (260) parts. This completes the solution.

The articles to be plated and the tin are suspended in the bath, and thebattery applied in the usual manner for electroplating with othermetals, save that the batterypower should be about forty (40) per cent.less than the usual power for depositing silver.

The proportion may be somewhat varied from that mentioned, but it isfound the proportions named give good results.

Iron or softer metals, as britannia, are thus plated with tin withoutprevious preparation.

I claim The herein described solution for electroplating, consisting ofmuriate of tin, sulphate of ammonia, sulphuric acid, aqua ammonia,urine, and water, in the proportions substantially as specified.

HENRY G. COYLE.

\Vitnesses GEORGE A. FAY, FRANK S. FAY.

